"Yeah, a lot of memories in here, and a lot of shows we haven't gotten, so we just keep banging on it," Summerfest Entertainment Director Bob Babisch said.

Babisch just finished his 37th year of booking acts for Summerfest.

"When somebody walks on a stage and you've got all 25,000 people jumping up and screaming at once, or anywhere on the grounds screaming at once, that's what it's all about man, and you're part of that moment," Babisch said.

It's a mix of genres.

"You try to have an eclectic lineup in the amphitheater and the grounds. You try to have something for everybody," Babisch said.

It's a high-intensity responsibility -- a chess board of groups with around 800 entertainers.

"This band wants to play this day, and this band wants to play this day. Oh, now this band can't play this day. It's going to play that day, but now we have two country acts so somebody is going to have to move off that day," Babisch said.

It's a job that doesn't stay at the office.

"On the phone, even at my house, and I'll be upset that something is canceling and you'll be going back and forth and you're yelling and you put down the phone, and you'll be really mad, then I look at my wife and go, 'Man, I really love this,'" Babisch said.